Simultaneous Improvement of Strength and Toughness of Poly(lactic acid) <italic style="font-style: italic">via</italic> Multiple Dynamic Pressure

Wen-Xu Rao; Lan-Wei Li; Sen-Hao Zhang; Guang-Ming Huang; Jia-Chun Zheng; Chen-Hu Yuan; Zhao-Xia Huang; Jin-Ping Qu

doi:10.1007/s10118-025-3379-6

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Simultaneous Improvement of Strength and Toughness of Poly(lactic acid) via Multiple Dynamic Pressure

RESEARCH ARTICLE | Updated：2025-08-25

- Simultaneous Improvement of Strength and Toughness of Poly(lactic acid) via Multiple Dynamic Pressure
- Simultaneous Improvement of Strength and Toughness of Poly(lactic acid) via Multiple Dynamic Pressure
- 高分子科学（英文） 2025年43卷第9期页码：1602-1615
- Affiliations：
  
  National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
- Author bio：
  
  mehuangzx@scut.edu.cn
- Funds：
  
  This work was financially supported by the National Key Research and Development Program of China (No. 2023YFC3904604), the Fundamental Research Funds for the Central Universities (No. 2024ZYGXZR080), Science and Technology Project of Guangzhou (No. 2025A04J3914) and Research and Development Program of Jiangmen (No. 2023780200030009506).;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-025-3379-6.
- DOI：10.1007/s10118-025-3379-6
  中图分类号：
- 收稿：2025-02-22，
  
  修回：2025-03-13，
  
  录用：2025-05-12，
  
  网络首发：2025-07-03，
  
  纸质出版：2025-09-05
- Accepted：
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Rao, W. X.; Li, L. W.; Zhang, S. H.; Huang, G. M.; Zheng, J. C.; Yuan, C. H.; Huang, Z. X.; Qu, J. P. Simultaneous improvement of strength and toughness of poly(lactic acid) via multiple dynamic pressure. Chinese J. Polym. Sci. 2025, 43, 1602–1615

Wen-Xu Rao, Lan-Wei Li, Sen-Hao Zhang, et al. Simultaneous Improvement of Strength and Toughness of Poly(lactic acid) via Multiple Dynamic Pressure[J]. Chinese Journal of Polymer Science, 2025, 43(9): 1602-1615. DOI: 10.1007/s10118-025-3379-6.
Rao, W. X.; Li, L. W.; Zhang, S. H.; Huang, G. M.; Zheng, J. C.; Yuan, C. H.; Huang, Z. X.; Qu, J. P. Simultaneous improvement of strength and toughness of poly(lactic acid) via multiple dynamic pressure. Chinese J. Polym. Sci. 2025, 43, 1602–1615 DOI： 10.1007/s10118-025-3379-6.

Wen-Xu Rao, Lan-Wei Li, Sen-Hao Zhang, et al. Simultaneous Improvement of Strength and Toughness of Poly(lactic acid) via Multiple Dynamic Pressure[J]. Chinese Journal of Polymer Science, 2025, 43(9): 1602-1615. DOI: 10.1007/s10118-025-3379-6. DOI：

摘要

This study proposes a novel multiple dynamic pressure forming process. Cyclic pressure loading and unloading aligns solid-phase PLA molecular chains along the tensile direction

increasing ordered crystalline content and strengthening crystal-amorphous interphase connectivity

thereby enhancing mechanical strength and toughness of PLA.

Abstract

To retain its inherent biodegradability

simultaneously improving the strength and toughness of poly(lactic acid) (PLA) is a significant challenge. In this study

we propose an innovative multiple dynamic pressure (MDP) process that can produce pure PLA with excellent mechanical properties. The MDP process generates a dynamic stretching effect by regulating the application and release of pressure

prompting disordered molecular chains to be arranged regularly along the direction of the dynamic force field. This promoted the formation of more ordered crystal forms (

-form) and strengthened the connection between the crystalline and amorphous regions. Results show that after MDP treatment

the tensile strength and strain at break of MDP-PLA are significantly improved

reaching 91.6 MPa and 80.1% respectively

which are 49.4% higher and 10 times higher than those of the samples before treatment. The mechanical properties of MDP-PLA can be regulated as needed by adjusting the cycle times and peak pressure. In addition

through a systematic study of the structural evolution of MDP-PLA

the performance regulation mechanism of the MDP process was thoroughly investigated

and the internal relationship among the process-structure-performance was clarified. This research not only opens a new technical path for the preparation of high-performance pure PLA but also provides important guidance for the high-performance modification of other semi-crystalline polymers

thus possessing significant scientific and engineering value.

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Simultaneous Improvement of Strength and Toughness of Poly(lactic acid) via Multiple Dynamic Pressure

DOI：10.1007/s10118-025-3379-6

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Abstract

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